Somewhere down that path one of the executive admins should have put the brakes on that particular book purchase. The fact that they didn't says something about the company.
If she was the only person that received 50 Shades and other people received different books then that is an obvious case of harassment.
Or somebody thought "50 Shades of Grey is a popular book with young women, and it'll show we're cool and modern", and didn't think farther than that.
You can definitely make a case for this being harassment of some sort if you _really_ want to see it under that light, but without more context it could easily be an honest mistake.
If she was the only person that received 50 Shades and other people received different books then that is an obvious case of harassment.